Earth-boring auger



UNITED STATES PATENT OFFICE.

A. A. MCMAHEN, OF OXFORD, MISSISSIPPI.

EARTH-BORING AUGER.

Specification of Letters Patent No. 24,749, dated July 12, 1859.

To all whom 'it may concern:

Be it known that I, A. A. MGMAHEN, of Oxford, in the county of Lafayette and State of Mississippi, have invented certain new and useful Improvements in Angers for Boring in Earth; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in which Figure l, represents a perspective view and Figs. 2, and 3, represent vertical sec tions through said auger.

The nature of my invention consists in the method of bracing together the two ends of the spiral portion of the auger by means of a rod which constitutes the elongation of the auger shaft, for the purpose of stiffening said spiral portion, and to prevent it from being twisted or compressed during the operation.

It also relates to the manner of securing the boring tool, to the spiral portion of the auger, by means of which said boring tool may be removed and replaced without changing or removing any part of said spiral portion.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, represents the main shaft of the auger, to the upper end of which the levers or their equivalents are secured for the purpose of turning the auger.

B is a cylindrical guide block, which iits the bore of the well, and which serves to re-` tain the shaft A, in its central and true position during the operation of boring. The block B, is hung upon the shaft A, by means of the plate a, resting upon the shoulder B.J and it is screwed down on said shoulder by the screw nut c.

C, represents the barrel, which ts over the auger, and which is to receive the bor ings of the same; it is secured to the shaft A, by being hung upon the shoulder (l, and it is held down on said shoulder by means of the sleeve f, which is keyed to the shaft A, by the key z'.

D, represents the spiral part of the auger,

which serves to raise the borings inthe barrel O; it is welded at its upper end to the shaft A, and both constitute one piece.

E, represents a straight shaft, the upper and forked end of which is secured to the square end of the shaft A, by means of the screw bolt g, while its hollow lower end is secured to the spiral D, and to the auger in the following manner: F, represents the drill, and G, the reamer which latter bores the well to the required diameter. H, represents the bit which cuts the material after it has been loosened by the drill and reamer, and which forces it into the barrel C. The stem L, of the reamer screws or fastens through the bit H, through the hub It, of the spiral D, and into the hollow end of the shaft E, and thus the shaft E, spiralrD, the bit I-I, and the reamer G, are firmly secured together by the screw shank L, while at the same time, the upper and lower ends of the spiral D, are firmly braced together making said spiral stiff, and preventing it from vibrating or twisting. The lower cutting edge m of the bit H, causes the borings to rise on to the upper side of said bit, whereby the action of the spiral D, and by the pres-4 sure of the succeeding borings, they rise in the barrel O. The passage through the bit H, is closed at its upper side by a spring plate or valve I), which prevents the water or borings from escaping downward, while as it opens inward it readily admits the borings from below. Q, represents a hole for the escape of the water upward and O, represents a handle or hand bolt for adjusting the barrel C, over the auger.

By the arrangement as above described it will be seen that the drill F, as well as the bit H, may be removed by simply unscrewing the drill F, and as these are the working tools, and consequently require a frequent sharpening, it is very essential that the operator may be enabled to remove and replace them with facility, such as the arrangement herein described affords.

Having thus fully described the nature of my invention, what I claim therein as new and desire to secure by Letters Patent is,

1. Bracing the two ends of the spiral portion of the auger by means of the central l D, substantially in the manner, and for the rod E, substantially in the manner, and for purposes descrlbed. the purposes herein described.

2. I also claim the manner of securing the A' A' MCMAHEN' 5 boring tools F, Gr, and H, to the spiral D, f' Witnesses:V

by which they may be removed and replaced JAMES RIGGS, v Without making any changes on the spiral l v THOS. H. ROBINSON. J- 

